WP_Customize_Nav_Menus::ajax_insert_auto_draft_post

		return $item_types;
	}

	/**
	 * Add a new `auto-draft` post.
	 *
	 * @since 4.7.0
	 *
	 * @param array $postarr {
	 *     Post array. Note that post_status is overridden to be `auto-draft`.
	 *
	 * @var string $post_title   Post title. Required.
	 * @var string $post_type    Post type. Required.
	 * @var string $post_name    Post name.
	 * @var string $post_content Post content.
	 * }
	 * @return WP_Post|WP_Error Inserted auto-draft post object or error.
	 */
	public function insert_auto_draft_post( $postarr ) {
		if ( ! isset( $postarr['post_type'] ) ) {
			return new WP_Error( 'unknown_post_type', __( 'Invalid post type.' ) );
		}
		if ( empty( $postarr['post_title'] ) ) {
			return new WP_Error( 'empty_title', __( 'Empty title.' ) );
		}
		if ( ! empty( $postarr['post_status'] ) ) {
			return new WP_Error( 'status_forbidden', __( 'Status is forbidden.' ) );
		}

		/*
		 * If the changeset is a draft, this will change to draft the next time the changeset
		 * is updated; otherwise, auto-draft will persist in autosave revisions, until save.
		 */
		$postarr['post_status'] = 'auto-draft';

		// Auto-drafts are allowed to have empty post_names, so it has to be explicitly set.
		if ( empty( $postarr['post_name'] ) ) {
			$postarr['post_name'] = sanitize_title( $postarr['post_title'] );
		}
		if ( ! isset( $postarr['meta_input'] ) ) {
			$postarr['meta_input'] = array();
		}
		$postarr['meta_input']['_customize_draft_post_name'] = $postarr['post_name'];
		$postarr['meta_input']['_customize_changeset_uuid']  = $this->manager->changeset_uuid();
		unset( $postarr['post_name'] );

		add_filter( 'wp_insert_post_empty_content', '__return_false', 1000 );
		$r = wp_insert_post( wp_slash( $postarr ), true );
		remove_filter( 'wp_insert_post_empty_content', '__return_false', 1000 );

		if ( is_wp_error( $r ) ) {
			return $r;
		} else {
			return get_post( $r );
		}
	}

	/**
	 * Ajax handler for adding a new auto-draft post.
	 *
	 * @since 4.7.0
	 */
	public function ajax_insert_auto_draft_post() {
		if ( ! check_ajax_referer( 'customize-menus', 'customize-menus-nonce', false ) ) {
			wp_send_json_error( 'bad_nonce', 400 );
		}